cough mixture 
noun [mass noun] British
Liquid medicine taken to relieve a cough: I have some cough mixture from home [count noun]: it is widely found in cough mixtures...
- Some of the potentially addictive substances contained in medicines such as cough mixture and painkillers include codeine, amphetamines, and opium-derived substances.
- I imagine her lozenges and the recovering man's cough mixture contained enough mild sedatives to hook them.
- Check with the pharmacist before taking a cough mixture containing a decongestant.